AP Highlight in History: On April 19, 1995, a truck bomb exploded outside the Alfred P. Murrah Federal Building in Oklahoma City, killing 168 people and injuring 500. (Timothy McVeigh was later convicted of federal murder charges and executed.)
The American Revolutionary War began with the battles of Lexington and Concord.
The first Boston Marathon was run.
The United States went off the gold standard.
Tens of thousands of Jews living in the Warsaw Ghetto began an uprising against Nazi forces.
Gen. Douglas MacArthur, relieved of his command by President Harry S. Truman, bid farewell to Congress, quoting a line from a ballad: "Old soldiers never die; they just fade away."
Gen. Douglas MacArthur
The Federal Communications Commission authorized regular FM stereo broadcasting starting on June 1, 1961.
A 51-day siege at the Branch Davidian compound near Waco, Texas, ended when fire destroyed the structure after federal agents smashed their way in. Dozens of people, including sect leader David Koresh, were killed.
FBI agent Bob Ricks says the fire appeared to be a mass suicide.